Remove URL patterns from the blocklist.
AI agents call browser_unblock to permanently remove resources in Termux Browser Pilot — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Removing entries from a blocklist is an irreversible security configuration change that cannot be easily undone in an automated context. It weakens security controls by re-allowing previously blocked URLs, which could expose the browser to malicious sites. This is closer to Destructive than Write because it removes a security restriction rather than just modifying data reversibly.
From the tool's definition Remove URL patterns from the blocklist
Documented attack patterns abuse exactly the kind of access browser_unblock gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Termux Browser Pilot, and nothing reaches the server without passing your rules. This is the rule we recommend for browser_unblock:
{
"version": "1",
"default": "deny",
"hide": [
"browser_unblock"
]
}browser_unblock disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Remove URL patterns from the blocklist. It is categorised as a Destructive tool in the Termux Browser Pilot MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Termux Browser Pilot MCP server in PolicyLayer and add a rule for browser_unblock: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Termux Browser Pilot. Nothing to install.
browser_unblock is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the browser_unblock rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for browser_unblock. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
browser_unblock is provided by the Termux Browser Pilot MCP server (salviz/termux-browser-pilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Termux Browser Pilot, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
148 Termux Browser Pilot tools catalogued and risk-classified — across an index of 43,000+ MCP servers.